2.6k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Instituto Superior TécnicoPT201 papers
- University of LisbonPT82 papers
- Universidade Técnica de LisboaPT54 papers
- Universitat de ValènciaES44 papers
- Instituto Politécnico de LisboaPT30 papers
- Instituto de Física CorpuscularES16 papers
- Thomas Jefferson National Accelerator FacilityUS15 papers
- European Organization for Nuclear ResearchCH13 papers
- Centre National de la Recherche ScientifiqueFR12 papers
- Consejo Superior de Investigaciones CientíficasES10 papers
- Centro de Física Teórica e Computacional9 papers
- University of ÉvoraPT9 papers
17 papers · 1 filter
Phenomenology of LFV at low-energies and at the LHC: strategies to probe the SUSY seesaw
A. M. Teixeira, A. Abada, A. J. R. Figueiredo +1
We study the impact of a type-I SUSY seesaw concerning lepton flavour violation (LFV) at low-energies and at the LHC. At the LHC, $ χ_2^0\to \tilde \ell \,\ell \to \ell \,\ell\,χ_1…
NSI can improve LMA predictions: neutrino decay in solar matter?
Joao Pulido, C. R. Das
We investigate the prospects for non-standard interactions (NSI) in solar neutrino propagation and detection and find that these may solve the tension between the observed flatness…
Valence quark contributions for the gamma N -> P11(1440) transition
G. Ramalho, K. Tsushima
A covariant spectator quark model is applied to estimate the valence quark contributions to the$ F1*(Q2) and F2*(Q2) transition form factors for the gamma N -> P11(1440) reaction.…
SU(2) Lattice Gauge Theory Simulations on Fermi GPUs
Nuno Cardoso, Pedro Bicudo
In this work we explore the performance of CUDA in quenched lattice SU(2) simulations. CUDA, NVIDIA Compute Unified Device Architecture, is a hardware and software architecture dev…
A model for the Delta(1600) resonance and gamma N -> Delta(1600) transition
G. Ramalho, K. Tsushima
A covariant spectator constituent quark model is applied to study the gamma N -> Delta(1600) transition. Two processes are important in the transition: a photon couples to the indi…
A covariant formalism for the N* electroproduction at high momentum transfer
G. Ramalho, Franz Gross, M. T. Pena +1
A constituent quark model based on the spectator formalism is applied to the gamma N -> N* transition for the three cases, where N* is the nucleon, the Delta and the Roper resonanc…
Improving LMA predictions with non-standard interactions: neutrino decay in solar matter?
C. R. Das, Joao Pulido
It has been known for some time that the well established LMA solution to the observed solar neutrino deficit fails to predict a flat energy spectrum for SuperKamiokande as opposed…
Constraining Dark Matter Properties with Gamma-Rays from the Galactic Center with Fermi-LAT
Nicolas Bernal, Sergio Palomares-Ruiz
We study the capabilities of the Fermi-LAT instrument on board of the Fermi mission to constrain particle dark matter properties, as annihilation cross section, mass and branching…
Basis invariant conditions for supersymmetry in the two-Higgs-doublet model
P. M. Ferreira, Howard E. Haber, Joao P. Silva
The minimal supersymmetric standard model involves a rather restrictive Higgs potential with two Higgs fields. Recently, the full set of classes of symmetries allowed in the most g…
CP properties of symmetry-constrained two-Higgs-doublet models
P. M. Ferreira, M. Maniatis, O. Nachtmann +1
The two-Higgs-doublet model can be constrained by imposing Higgs-family symmetries and/or generalized CP symmetries. It is known that there are only six independent classes of such…
The QCD string tension curve, the ferromagnetic magnetization, and the quark-antiquark confining potential at finite Temperature
P. Bicudo
We study the string tension as a function of temperature, fitting the SU(3) lattice QCD finite temperature free energy potentials computed by the Bielefeld group. We compare the st…
Annihilation vs. Decay: Constraining dark matter properties from a gamma-ray detection
Sergio Palomares-Ruiz, Jennifer M. Siegal-Gaskins
Most proposed dark matter candidates are stable and are produced thermally in the early Universe. However, there is also the possibility of unstable (but long-lived) dark matter, p…
Nearest-Neighbour Interaction from an Abelian Symmetry and Deviations from Hermiticity
G. C. Branco, D. Emmanuel-Costa, C. Simoes
We show that Nearest-Neighbour Interaction (NNI) textures for the quark mass matrices can be obtained through the introduction of an Abelian flavour symmetry. The minimal realisati…
Electromagnetic form factors of the Delta with D-waves
G. Ramalho, M. T. Pena, Franz Gross
The electromagnetic form factors of the Delta baryon are evaluated within the framework of a covariant spectator quark model, where S and D-states are included in the wave func…
Valence quark contributions for the gamma N -> P11(1440) form factors
G. Ramalho, Kazuo Tsushima
Using a covariant spectator quark model we estimate valence quark contributions to the F1*(Q2) and F2*(Q2) transition form factors for the gamma N -> P11(1440) reaction. The Roper…
Renormalization-group constraints on Yukawa alignment in multi-Higgs-doublet models
P. M. Ferreira, L. Lavoura, Joao P. Silva
We write down the renormalization-group equations for the Yukawa-coupling matrices in a general multi-Higgs-doublet model. We then assume that the matrices of the Yukawa couplings…
Mass-radius relation for magnetized strange quark stars
A. Perez Martinez, R. Gonzalez Felipe, D. Manreza Paret
We review the stability of magnetized strange quark matter (MSQM) within the phenomenological MIT bag model, taking into account the variation of the relevant input parameters, nam…